Jacob  is capably navigating not only the bumps and crevices on the  sol , but also invisible buildings and other sorts of obstacles which inhabit the inner  espace  his 4th  dimensions   chaussures  are walking through. Here we see what he sees as he turns past the  aigu  edge of a noise-walled  immeuble .     Maintenant que j'avais voyagé dans les ténèbres, j'étais sur d'être suivi en sortant.